PHRYGANEID&. 
Foop or Larva:.—The stomachs examined contained nothing 
but fragments of disintegrated leaves—the only soft vegetable mat- 
ter in the stream where the larve were found. It is probable that 
this species, like N. postica, has little preference for the kind or 
condition of the leaves it eats, and that the variety of its diet is 
in about the proportion of the variety of the soft plant materials in 
the water it inhabits. 
DESCRIPTION OF THE Larva.—Length, 20 mm. ; breadth, 3 mm. 
No structural or color characters have been found to separate 
the larva of this species from NV. pardalis. 
NEURONIA STYGIPES. 
19. Larva. Head and thorax. 20. Larva. Frons. 
Head.—Straw-yellow marked with dark-brown, as shown in 
figure 19. A dark-brown mark starting at the base of each man- 
dible extends diagonally back parallel to the outer margin of the 
frons, to the hind margin of the head, where the two almost touch 
the epicranial suture; a dark-brown mark begins slightly behind 
and a little below each eye, and extends back to the hind margin 
of the head; on the under side from the mouth parts to the hind 
margin the head is clouded with smoky brown; between this 
clouding and the postocular mark the straw color of the head is 
unshaded; a narrow white area surrounds each eye. The frons 
(figure 20) has the straw-yellow ground color of the rest of the 
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